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Distal trisomy 10q and limb defects.
1School of Medicine, University of Maryland at Baltimore, USA.
Annales De Genetique
|October 17, 2002
Summary
Tibial hypoplasia and aplasia are characteristic of trisomy 10q25.2-qter. This genetic condition can cause limb maldevelopment, including defects in the upper and lower extremities.
Area of Science:
- Genetics
- Developmental Biology
- Clinical Genetics
Background:
- Trisomy 10q, specifically the distal region 10q25.2-qter, is a rare chromosomal abnormality.
- Limb malformations are observed in various genetic syndromes, but specific associations require detailed analysis.
Purpose of the Study:
- To identify characteristic limb defects associated with trisomy 10q25.2-qter.
- To investigate the potential role of the 10q25.2-qter chromosomal segment in limb development.
Main Methods:
- Literature review and analysis of reported cases with trisomy 10q25.2-qter.
- Correlation of genetic findings with phenotypic manifestations, particularly limb abnormalities.
Main Results:
- Tibial hypoplasia or aplasia was identified in at least six individuals with trisomy 10q25.2-qter.
- Associated defects included hypoplastic femora, ectrodactyly, and preaxial polydactyly in lower extremities; upper limb anomalies were noted in one case.
- These findings suggest tibial malformations are a characteristic manifestation of distal trisomy 10q.
Conclusions:
- Tibial defects should be recognized as a key feature of trisomy 10q25.2-qter.
- The 10q25.2-qter segment likely harbors genes critical for limb development, and triplication can lead to a field defect affecting multiple extremities.